Four layer seam multi-axial fabric

Abstract

A fabric and a method of forming a fabric formed by the steps of providing an endless fabric having at least two layers of MD yarns, raveling CD yarns in an area of said endless fabric to be cut, cutting at least one layer of MD yarns at a first predetermined location, and cutting at least one layer of MD yarns at a second predetermined location. The method also includes steps of folding the endless fabric in half in the MD direction, placing the first and second predetermined locations proximally to one another, forming loops from at least one uncut layer of MD yarns when said fabric is folded, and seaming the loops to form an endless fabric.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to papermaker's fabrics and in particular to fabrics which are seamed to provide for an endless fabric when installed on papermaking equipment.[0003]2. Description of the Prior Art[0004]During the papermaking process, a cellulosic fibrous web is formed by depositing a fibrous slurry, that is, an aqueous dispersion of cellulose fibers, onto a moving forming fabric in the forming section of a paper machine. A large amount of water is drained from the slurry through the forming fabric, leaving the cellulosic fibrous web on the surface of the forming fabric.[0005]The newly formed cellulosic fibrous web proceeds from the forming section to a press section, which includes a series of press nips. The cellulosic fibrous web passes through the press nips supported by a press fabric, or, as is often the case, between two such press fabrics. In the press nips, the cellulosic fibrous web is subjected t...

AI Technical Summary

Benefits of technology

The present invention provides a multi-layer papermakers fabric that has improved seam characteristics. The fabric is made by a spiral winding process that minimizes the effects of the seam on the paper sheet. The invention also includes a seaming method for the fabric that achieves the aforementioned objectives. The multi-layer fabric has at least two layers of MD yarns and is formed by cutting and folding the fabric. The base fabric is a multi-axial fabric made from a fabric strip of yarn material that is spirally wound over at least two rolls with parallel axes. The technical effects of the invention include improved seam quality, reduced seam impact on paper quality, and improved efficiency in the papermaking process.

Problems solved by technology

Needless to say, this requirement makes it difficult to streamline the manufacturing process, as each press fabric must typically be made to order.

These fabrics wear out and require replacement.

As such, their use had been limited to press sections having cantilevered press rolls and other components, which permit an endless press fabric to be installed from the side of the press section.

However, the folded fabric again requires a seaming arrangement that will not reduce the strength of the fabric or cause marking, whilst being relatively easy to install.

Images